Systemd as command not available on ubuntu 24.10, only have systemctl

[lucashc]

Bug description

The bootstrap.py script complains that there is no SystemD installed on Ubuntu Servere 24.10. This is false, the systemd binary is not in path, but systemctl is.
Should most likely remove not shutil.which("systemd") at line 232 in bootstrap.py

How to reproduce

1. Use freshly installed Ubuntu 24.10
2. Use the custom server installation guide that runs bootstrap.py

Expected behaviour

It should work in a SystemD environment without the systemd binary being in path.

Actual behaviour

Output: Systemd is required to run TLJH

Your personal set up

Ubuntu Server 24.10 in a local KVM VM. Freshly installed, only ran sudo apt install python3 python3-dev git curl as listed in the guide.

[lucashc]

Deleting that part let's the script run happily

[lucashc]

I can fix this bug by changing the check. Docker containers might ship SystemD binaries, but do not run them. Therefore, we have to check if SystemD is in a usable state.
To do so, we need to issue systemctl is-system-running --quiet and check the exit code.
If agreed, I can submit such a pull request.